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There is no gold standard test that gives a clear, unequivocal answer to the question does this person have a vitamin B12 deficiency, yes or no
If youre looking for a more reliable way to get the benefits of this essential nutrient, from improved energy to better cognitive function, its worth comparing oral supplements to vitamin B12 injections
But not everyone who feels tired is B12 deficient, and not everyone with low B12 requires an injection
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